I use Handbrake to encode all of my stuff and I have both an Apple TV 4th Gen and a Apple TV 4K. I've been a x264 person but I am now making the change to H265. One observation is that the Apple TV 4th Gen has ever so slight issues with the H265 content. Occasional frame rate dips and/or out of sync issues. In nearly all cases the video will recover and get back on track. The Apple TV 4K has zero issues with H265.

To the best of my ability I haven't found any setting/adjustment that can correct this, so I am assuming it simply comes down to a processor issue (A8 vs A10X). NOTE: I'm on tvOS 11.2 and MrMC 3.3.

I use Handbrake to encode all of my stuff and I have both an Apple TV 4th Gen and a Apple TV 4K. I've been a x264 person but I am now making the change to H265. One observation is that the Apple TV 4th Gen has ever so slight issues with the H265 content. Occasional frame rate dips and/or out of sync issues. In nearly all cases the video will recover and get back on track. The Apple TV 4K has zero issues with H265.

To the best of my ability I haven't found any setting/adjustment that can correct this, so I am assuming it simply comes down to a processor issue (A8 vs A10X).

This all said, I'll be upgrading my 4th Gen to a 4K model.

Check the video acceleration settings. v3.3.0 will vector hevc/hdr to avfoundation codec but it should be only vectoring 4K content. Talking HEVC Main 10, not normal HEVC content.